Schedule of Weighted Average Shares Outstanding Used to Compute Earnings Per Common Share (Detail) - shares shares in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 25, 2017 |
Jun. 26, 2016 |
Jun. 25, 2017 |
Jun. 26, 2016 |
|
| Weighted Average Shares Used In Computing Earnings Per Share [Line Items] | ||||
| Weighted average common shares outstanding for basic computations | 288.5 | 303.1 | 289.2 | 303.8 |
| Weighted average dilutive effect of equity awards | 2.7 | 4.0 | 2.8 | 4.1 |
| Weighted average common shares outstanding for diluted computations | 291.2 | 307.1 | 292.0 | 307.9 |